通过冻融法制备菲可、派可和白蛋白梯度液。

Prep Biochem. 1979;9(2):149-56. doi: 10.1080/00327487908061680.

Ficoll, sucrose, albumin, and Percoll, a modified colloidal silica centrifugation medium, all form density gradients upon freezing and thawing. The data suggest that any density gradient material will form gradients upon freezing and thawing, provided the material is stable to freezing.

菲可（聚蔗糖）、蔗糖、白蛋白以及经改良的胶体二氧化硅离心介质派可（聚泛影葡胺）在冻融后均会形成密度梯度。数据表明，只要材料对冷冻稳定，任何密度梯度材料在冻融后都会形成梯度。